[BUG]: Linting raises library-not-found problem when import type_extensions

[JCZuurmond]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

We raise a library-not-found problem when import type_extentions

if TYPE_CHECKING:
    from typing_extensions import ParamSpec

    P = ParamSpec("P")

Expected Behavior

No problem should be raised. Maybe we should white list this library

Steps To Reproduce

1. Create unit test for above code snippet

Cloud

Azure

Operating System

macOS

Version

latest via Databricks CLI

Relevant log output

No response

[ericvergnaud]

This happens when PathLookup is a mock because then it doesn't find typing_extensions.py.
Added a test in #1709